C8051F704-GMR

Overview

The C8051F704-GMR is an 8-bit mixed-signal microcontroller from the Silicon Labs C8051F70x family, featuring a high-speed pipelined 8051 core with up to 25 MIPS throughput at a 25 MHz clock. It integrates 16 kB of in-system programmable Flash memory, 512 bytes of internal data RAM, and 32 bytes of data EEPROM. The device includes a 10-bit ADC capable of up to 500 ksps, a Capacitance to Digital Converter for sensing applications, and multiple digital peripherals including UART, SMBus, and SPI. Operating within a supply voltage range of 1.8 V to 3.6 V, it supports temperatures from –40 °C to +85 °C and is available in a 48-pin QFN package.

Feature Summary

• Integrated Capacitance to Digital Converter supporting capacitive proximity and touch screen sensing with auto-scan capabilities
• On-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without external emulators
• High-speed 8051 core executing 70% of instructions in one or two system clocks for efficient processing
• Flexible clock sources allowing on-the-fly switching between internal oscillators and external crystals

Applications

• Capacitive sensing interfaces for buttons, sliders, and wheels
• Portable medical equipment requiring mixed-signal integration
• Test equipment utilizing high-speed analog-to-digital conversion
• Fiber optic systems needing precise timing and communication interfaces

Procurement Notes

Verify the specific suffix 'GMR' corresponds to the 48-pin QFN package and tape-and-reel packaging format as defined in the official ordering information. Confirm that the component meets RoHS compliance standards required for your assembly process. Ensure that design-in activities account for the 'Not Recommended for New Designs' status indicated in the documentation to mitigate future supply chain risks.

Selection Notes

Select this component when a fully integrated mixed-signal solution with capacitive sensing capabilities is required alongside standard 8051 functionality. Consider the 16 kB Flash limit and 512-byte RAM capacity against application memory requirements. Evaluate the 1.8 V to 3.6 V operating range to ensure compatibility with the target system power rails and peripheral voltage levels.

Part Context

This part belongs to the C8051F70x/71x family of mixed-signal ISP Flash MCUs designed by Silicon Laboratories. These devices are characterized by their high analog integration, including dedicated capacitance sensing hardware and multiple ADCs. The family targets applications demanding standalone system-on-chip solutions with extensive I/O and communication peripherals.

Replacement Considerations

Silicon Labs recommends EFM32PG26B301F2048IL136 or other EFR32PG26 Series 2 MCUs as replacements for this end-of-life component. Verify pinout compatibility and software migration efforts when transitioning to the recommended ARM-based alternatives.

FAQ

What is the maximum sampling rate of the integrated ADC?

The integrated 10-bit Analog to Digital Converter (ADC) supports a maximum sampling rate of up to 500 ksps.

Does the C8051F704 support capacitive sensing directly?

Yes, it features a dedicated Capacitance to Digital Converter (CS0) that supports up to 38 input channels for buttons, sliders, and touch screens.

Is external emulator hardware required for debugging?

No, the device includes on-chip debug circuitry that facilitates full-speed, non-intrusive in-system debugging without the need for additional emulation systems.